I think it's easy fix. Just don't know where the mount -o loop command is.I presume it in some of the files in /etc/init.dI think it's the mount command tries first to mount the tcz files in F2FS filesystem.

Maybe it's a new function in busybox.. what i can see...it says...Filesystem autodetection requires /proc...Don't know how it's detection is made through proc.

I presume this could also be like default for not just picore, for even the others tiny core.

Good that i found the thing..my self....learning a lot how to search in linux systems by doing this.Just found -prune in find...maybe i will make a alias of this...Exaple: find / -path /proc -prune -or -iname *findme*or do it little crazy with for this:grep loop $(file * | grep ASCII|cut -f1 -d':')

So if i understand you correctly this micropython thing is just a workaround for buggy busybox util-linux ?